Pain centered around inner forearm, radiates down to cause a tingling sensation in finger. What could be the cause?

I am not sure what this is, but I am a 23 year old female. Last night I developed a pain in my left forearm , that does not radiate up the neck or shoulder . It is centred around the inner forearm and shoots down to cause a tingling sensation in my pinky, ring finger and (not sure about my middle finger). It is starting to worry me